Doing dungeons and Alex Normal, I can't seem to keep up during burst phases unless I have the delayed spike damage from Wildfire (ontop of Reload + Rapid fire combo rotation).
Otherwise without it (Wildfire), my MCH dmg doesn't seem to have any other way to front load a butt-load of dmg for burst.
I may resort to praying to RNG-esus for the procs... but well, that never goes well.
Edit:
I strongly feel that Wildfire is key... fudging Wildifre leaves (my) MCH really really behind.